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我用VCS與Verilog-XL模擬下面的程式結果輸出波形不同,
: T u- B$ Z5 |$ v# Q. U- p有大大可以幫我解答嗎??
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2 E i. c& c5 |$ R- v; ~+ _' h6 _verilog程式 : " L5 P5 y# o" B) m3 W% X; W! g
`timescale 1ns/100ps% r1 \8 w0 S. b1 M8 D- F. z; a2 J
module timing(clk, rst, in, out);
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+ K, C6 k* r y% i: Cinput clk, rst;
( d8 p; d/ C& Q/ Y, O2 Yinput [7:0] in;
: B$ m) r' i- Y1 G/ O1 C( v6 e3 Foutput [7:0] out;' Q" V0 D5 A% O% D( B) ]
reg [7:0] out;
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wire [7:0] out_temp;
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7 v% o+ `' b/ o1 jassign out_temp = in + 2;, F$ f% E' h7 X
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5 Z; x5 O) [& k7 _+ ?always @(posedge clk) begin
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if (rst)5 F! I+ B1 T0 N+ a2 g
out <= 8'd0;8 D* c% w3 }7 E9 A
else
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O# l. S5 S0 S' R! a+ k" M8 e out <= out_temp;$ W' h# H- l7 j8 C8 {/ G
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end
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; D& O" Y5 H# [1 {endmodule
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module test();" ~# C' ~6 f& }4 e3 N
. F. z; P; |) I- p3 O7 X! sreg clk, rst;+ x. K% |8 H' c7 a+ s+ l
reg [7:0] in;
+ F2 y0 T9 v8 r. G0 y% Rwire [7:0] out;4 C$ G, C6 l# ]6 p$ G$ V- U
' g, x6 G) t6 O7 C: k2 s u3 Qtiming timing (clk, rst, in, out);6 |; \6 M! I+ n9 L( f& v% ]
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) a8 I+ `, {+ i! l! c4 Cinitial begin: c! M9 m. B+ ]* R0 R
$fsdbDumpvars;
* S; B9 ~* W/ D& e T' }: X9 J clk = 0;
& S, ?2 R/ x4 z9 l1 k rst = 1;; d. X4 ~/ Z% Q2 I- O6 O/ C
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rst = 0;4 g; l. R+ Y8 C/ D' L% z7 M
#5
$ k. Y2 O4 U% \% |6 s in = 5;
a% ]) r6 O. p; k1 U #10
4 w% d o% P, u" L+ R in = 6;
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in = 7;
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in = 8;
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in = 9;, X5 w1 ?" o( e8 M v, e. n
#500 $finish;* R: K: k) l: C0 |! [4 c* Z$ B" ^
end# [' y7 p3 u1 G- F/ E
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always #5 clk = ~clk; 7 b. ~& S9 c( ]5 l7 K j
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endmodule
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( N4 s& M- T. V以下是VCS與Verilog模擬的圖2 s5 S6 N+ k3 A* @
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為什麼會不同??! R" L* u3 V% J: i! f Y
各位大大請幫我看看
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- n- g) F! B; P+ l0 q0 \6 R+ ?7 X+ z8 pPS: 我不是要交作業啦,只是在Simulation遇到問題
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謝謝.............................. |
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